KAAP180 Lecture Notes - Lecture 8: Body Shape, Sedentary Lifestyle, Bone Density
21 Mar 2017
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Document Summary
Body composition: the obesity epidemic & co- morbidities. Mass amount of matter in an object. Volume amount of 3d space occupied by object. Can be determined by water displacement: volume(object) = volume(liquid + object) volume(object). Weight force: mass x acceleration of gravity. Total body mass = fat mass + lean mass: lean mass: comprised of bone/muscle. Average tissue densities: lean mass components have higher densities than fat. Dxa: dual-energy x-ray absorptiometry measures bone mineral density (bmd). Body mass index (bmi): measure for human body shape based on person"s mass & height. Developed as simple numeric measure of a person"s thickness or thinness health profe- ssionals can discuss over/underweight problems more objectically with their patients. Bmi interpretation: underweight: < 18. 5, normal: 18. 5 24. 9, overweight: 25. 0-29. 9, obese: > 30. 0. Measurements aren"t always so accurate: do not take into account our lean body mass, short people higher bmi than accurate, tall people lower bmi than accurate.
